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Organic light-emitting element with hole injection layer having concave portion

a light-emitting element and concave portion technology, applied in the field of organic light-emitting elements, can solve the problems of difficult manufacturing of a properly functioning display, difficult to precisely adjust the position of the mask used in the mask vapor deposition method, and difficult application of vapor deposition type organic el elements to full-color, large-sized organic el panels with display sizes of around 100 inches, etc., to achieve excellent hole injection characteristics, and high dissolution resistance resistan

Active Publication Date: 2016-04-26
JOLED INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution ensures stable and efficient hole injection with reduced film thickness reduction, maintaining excellent light-emission characteristics and enabling low-voltage operation of OLEDs.

Problems solved by technology

However, although vapor deposition type organic EL elements are desirable for use in small-sized organic EL panels, the application of vapor deposition type organic EL elements to, for example, full-color, large-sized organic EL panels having display sizes of around 100 inches is extremely difficult.
Here, when the organic EL panel to be manufactured becomes greater in area, it is difficult to precisely adjust the position of the mask used in the mask vapor deposition method due to reasons such as the difference in thermal expansion coefficients between the mask and a glass substrate.
Hence, manufacturing of a display that operates properly is difficult.
Thus, in principle, an increased amount of power is consumed by the panel.

Method used

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  • Organic light-emitting element with hole injection layer having concave portion
  • Organic light-emitting element with hole injection layer having concave portion
  • Organic light-emitting element with hole injection layer having concave portion

Examples

Experimental program
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embodiment 1

[0085]FIG. 1 is a schematic cross-sectional view illustrating the structure of an organic EL element 1 pertaining to

[0086]The organic EL element 1 is an application type organic EL element. As such, the organic EL element 1 includes one or more functional layers having been formed by applying functional layer material by wet processing. The organic EL element 1 includes: a hole injection layer 4; one or more functional layers each containing organic material and having a predetermined function; and a pair of electrodes, composed of an anode 2 and a cathode 8. The hole injection layer 4 and the set of one or more functional layers, a buffer layer 6A and a light-emitting layer 6B in this example, are disposed one on top of the other, and are disposed between the pair of electrodes.

[0087]In specific, the organic EL element 1 includes, as illustrated in FIG. 1, a substrate 10, and the anode 2, the hole injection layer 4, the buffer layer 6A, the light-emitting layer 6B, and the cathode ...

embodiment 2

[0283]In embodiment 2, since the tungsten oxide layer constituting the hole injection layer 4A is formed under predetermined film forming conditions, the hole injection layer 4A includes a plurality of tungsten oxide crystals 13, as illustrated in FIG. 24B. The particle diameter of each crystal 13 is on the order of nanometers. As an example, whereas the thickness of the hole injection layer 4A is approximately 30 nm, the particle diameter of the crystals 13 is approximately between 3 and 10 nm. Hereinafter, the crystals 13, whose particle diameter is on the order of nanometers, are referred to as “nanocrystals 13”, and a layered structure composed of the nanocrystals 13 is referred to as a “nanocrystal structure”. Note that apart from the nanocrystal structure, the hole injection layer 4A may include an amorphous structure.

[0284]In the hole injection layer 4A with the above nanocrystal structure, the tungsten atoms constituting the tungsten oxide are distributed to include both ato...

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PUM

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Abstract

An organic EL element including anode, hole injection layer, buffer layer, light-emitting layer, and cathode, layered on substrate in the stated order, and banks defining a light-emission region, and having excellent light-emission characteristics, due to the hole injection layer having excellent hole injection efficiency, being a tungsten oxide layer including an oxygen vacancy structure, formed under predetermined conditions to have an occupied energy level within a binding energy range from 1.8 eV to 3.6 eV lower than a lowest binding energy of a valence band, and after formation, subjected to atmospheric firing at a temperature within 200 ° C. -230 ° C. inclusive for a processing time of 15-45 minutes inclusive to have increased film density and improved dissolution resistance against an etching solution, a cleaning liquid, etc., used in a bank forming process.

Description

TECHNICAL FIELD[0001]The present invention relates to an organic light-emitting element (referred to hereinafter as an “organic EL element”), which is an electric light-emitting element. Particularly, the present invention relates to a technology for driving such an organic EL element at low electricity while ensuring a wide range of luminous intensity from low luminous intensity to high luminous intensity for the use as a light source or the like.DESCRIPTION OF THE RELATED ART[0002]In recent years, progress is being made in the research and development of various functional elements that utilize organic semiconductors.[0003]An organic EL element is a typical example of such a functional element. An organic EL element is a current-driven light-emitting element, and typically includes a pair of electrodes, composed of an anode and a cathode, and one or more functional layers each containing organic material disposed between the pair of electrodes. In the present disclosure, the term ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H01L51/50H01L51/56H01L51/52
CPCH01L51/5215H01L51/5088H01L51/56H01L2251/303H10K50/17H10K2102/00H10K59/80517H10K50/816H10K71/00
Inventor YAMADA, RYUUTAOHUCHI, SATORUKOMATSU, TAKAHIROFUJIMURA, SHINYAFUJITA, HIROFUMI
Owner JOLED INC